I have GF 45 2.8 ... for me it is like good set-lens not good, not terrible 😉 i use 35/1.4 on GFX 50R (AF-convertor) and i don't recalculate it to kino-film ... this is physic F=35mm on all format, only angle is diff.
I use minolta MC 58/1.2 too, but this is manual, work for me and i can imagine the price for GFX ;-))
I can explain it easy ... becuase AF convertor don't work 100% (sometime say me bad lens ... and don't work long time) and i really like 35/1.4 ... i have 2 options ... use MF convertor ... or take Nikon D810 + 35/1.4 and goo ... wit this setup i take wedding in Vietnam and Dubai too (+ some in Europe) ... if i have time i use 135/1.8 sometime 24/1.4 and 14/1.8 - for street photo... but for me is 35/1.4 primary lens that work on any light ... and 2.8 is 2.8 nothing else yes recalculate DOF is 2.2 for 45 ... but light ???
Now i have only one favorite lens from FUJI GF 80/1.7 - if i have space, portrait or to atelier, perfect lens - I we bought it as soon as they released it.
Next that i love on GFX body is MF and how GFX do control MF on display/viewfinder ... this is genial ... but i use 35/1.4 for fast photo too, for composed foto (models) and for street photo ... day/night and flash